Operating means for saw-carriages.



C. JOHNSON.

OPERATING MEANS FOR SAW CARRIAGES.

APPLICATION FILED APR. 5. I9l8 INVENTOR %J;// 5v/M Patented Sept. 10, 1918.

2 SHEETSSHEET 1- WITNESS:

' ATTORNEY C. JOHNSON.

OPERATING MEANS FOR SAW CARRIAGES.

APPLICATION FILED APR. 5.1918.

Patented Sept. 10, 1918.

2 SHEETS-SHEET 2.

INVENTOR @%wfl/ ATTORNEY CLAUS JOHNSON, 0F PHILLIPS, WISCONSIN.

ornna'rme MEANS FOR SAW-CARRIAGES.

Specification of Letters Patent. Patented Sept. 10, 1918.

Application filed April 5, 1918. Serial No. 226,888.

To all whom it may concern:

Be it known that I, CLAUS JOHNSON, a citizen of the United States, and resident of Phillips, in the county of Price and State of lVisconsin, have invented certain new and useful Improvements in Operating Means for Saw-Carriages; and I do hereby declare that the following is a full, clear, and exactdescriptionthereof.

My invention relates to new and useful improvements in means for operating saw carriages and other reciprocative parts of analogous machinery.

A common method of moving the carriages which feed logs to circular sawsconsistsof a relatively long steam or compressed air cylinder in whicha piston 'is operable. Owing to the extreme length that is usually necessary to make the piston rod, the same is prone to bendorsag intermediate its ends, the sagging in some instances beingto such an extent that the rod drags on thewall of the cylinder. It is obvious that such engagement between the rod and the cylinder will have a very destructive effect on the latter and in time will cause the formation of a groove of sufficient depth to permit excessive leakage between the piston and the wall of the cylinder. M

It is therefore the object of the present invention to provide means which will prevent the contact between the piston rod and the cylinder wall.

A further object is to provide an arrangoement which may be effectively operated y the movement of the piston ifor projecting or retracting the means which spaces the piston rod from the cylinder wall.

With these and other objects in view, the invention resides in the novel features of construction, combination and arrangement of parts which will be hereinafter more particularly described and claimed and shown in the drawings wherein:

Figure 1 represents a longitudinal sectional view through aportion of a steam or compressed air cylinder which is adapted for mounting in a saw-mill, the same including my improved features.

Fig. 2 is a longitudinal section taken substantially on the plane of the line 22 of Fig. 1.

Fig. 3 is a detail transverse sectional view 5 on the plane of the line 3-3 of Fig. 1.

Fig. 4 is an enlarged sectional View through the mam portlon of the mvention.

Fig. 5 is a semi-diagrammatic view showing the relation of the invention to a full length piston cylinder and piston rod.

Referring more particularly to the drawings it will be seen that the numeral 1 denotes a plurality of cylinder sections, the opposite ends of which are flanged as at 2 .whereby they may be secured to each other. In this way a cylinder of requisite length may be built up, it being understood that in some instances it is not necessary to use a piston rod 3 of as great a length as in others. The length of the piston rod in turn obviously depends upon the distance which it is necessary to shift the part of the machine controlled by the reciprocation of the piston 4:. v

Fig. 5 illustrates the disadvantage of using a relatively long piston rod inasmuch as the same has sagged downwardly intermediate its ends. To prevent the engagement of the rod with the wall of the cylinder sections 1, I provide an inwardly and outwardly movable member in the form of a supplemental piston 5 which is operable transverse of the direction of movement of the main piston 4. This supplemental piston and the operating parts therefor are preferably carried by a cylinder section 1 attachable to any of the other cylinder sections 1.

The piston 5 has a rod 6 pivoted thereto which in turn is journaled to the crank 7 of a crank shaft 8, the opposite ends of which are mounted in the walls of a supplemental piston housing 9, the latter being formed integrally with the cylinder section 1. The head end 'of the piston 5 is curved to conform to the curvature of the inner surface of the cylinder, and-the portion of the latter immediately surrounding the opening through which the supplemental piston 5 projects is cut out as at 10 to relieve the pressure on the end of said piston 5 and allow the same to be readily projected inwardly. Formed on the bottom of the cylinder section 1 as in the case of the housing 9 and spaced therefrom is a second housing 11 which contains a trip lever 12, the latter being fixed on a transverse pivot shaft 13 journaled in the side walls of said housing 11. The trip lever is of suflioient length to project through the opening which provides communication between the housing 11 and the interior of the cylinder section 1 whereby it may be engaged by the main piston t during its reciprocation. One end of the crank shaft 8 xtends mitwardly of the housing 9 and is provided with a crank l t, and a similar crank 15 is fixed to the outwardly extending end of the pivot shaft 13, said cranks being connected by a pitman rod 16. The connection between the crank 15 and the adjacent end of the pitman rod relatively loose to allow the trip lever 12 to rock slightly without changing the position of the other crank 1%. The pivot shaft 13 is also provided with a depending weight 17 for normally holding the trip lever 12 relatively vertical.

The operation of the parts thus far described is substantially as follows: As the main piston 4: is moved away from the end of the cylinder through which the piston rod extends, it is eventually brought into engagement with the inner end of the trip lever 12 to rock the same in the same direction in which it is traveling as most clearly shown by the dotted lines in Fig. 1. This movement of the trip lever toward the left obviously causes the crank 1% to move in the same direction and thus oscillate the crank shaft 8. The crank shaft is shifted in this direction until the crank T engages a stop 18 projecting from one wall of the housing 9, the simplemcntal piston 5 being then in its innermost projected posit-ion.

Upon the further movement of the main piston t as indicated in Fig. 5 the trip lever 12 returns to a substantially vertical position due to the influence of the weight 17, the loose connection between said trip lever and the rod 16 readily permitting the vertical movement of the former without disengaging the crank 7 from its stop 18.

lVhen the main piston. at is now moved in a reverse direction, it will strike the trip lever and force it toward the right, thus moving the crank 7 away from said stop 18 and causing the lowering of the supplemental piston The main piston is thereby prevented from striking the supplemental piston, although the latter is not lowered until the former is relatively close thereto and the major portion of the piston rod projected outwardly of the cylinder.

Under certain conditions the trip lever 12 may not be able to assume a vertical position after being moved toward the left, as for instance when the piston i stops in the position indicated by the dotted line in Fig. 1. Therefore additional tripping means is pro vided for lowering the supplemental piston when the main piston is again moved toward the right. Such means includes a second trip lever 19 fixed on a pivot shaft 20 and disposed within a housing 21. Said housing is positioned between the housings 9 and 11 and a greater distance from the latter than the length of the main piston l. The shaft 20 has a crank 22 fixed thereto which is linked to a crank 23 on one end of the crank shaft 8 by a connecting rod 24-.

.111 view of this construction even though the main piston 1 does not move farther to the leftthan the position shown in dotted lines in Fig. 1, the supplemental piston will nevertheless be retracted before it can be engaged by the piston i inasmuch as the latter will first strike the trip lever 19 to force the same toward the right. Such movement of the second trip lever 19 produces the same effect on the crank shaft 8 as the similar movement of the trip lever 12.

From the foregoing description it will be seen that as the main piston is moved away from the end of the cylinder through which the piston rod projects, the supplemental piston will rise at the proper time to prevent engagement between the piston rod and the cylinder wall; similarly the supplemental piston will be retracted when danger of excessive sagging of the piston rod is over and before it can be struck by the piston Various minor changes may be made in the form and proportion of the various parts of the invention without departing from or sacrificing any of the improvements as for instance the structure herein illustrated may be varied for use on different machines having reciprocative carriages.

I claim as my invention:

1. In an apparatus of the class described, a relatively long piston cylinder, a piston operable in said. cylinder, a relatively long piston rod connected with the piston, a carriage or the like operable by said rod, a supplemental piston movable through the wall ofthe cylinder, said rod being adapted to engage the supplemental piston when the same is in one position, and means operable by the first mentioned piston in moving in opposite directions to shift the supplemental piston inwardly and outwardly of the cylinder.

2. In an apparatus of the class described, a relatively long piston cylinder, a piston operable in said cylinder, a relatively long piston rod connected with the piston, a carriage or the like operable by said rod, a supplemental piston movable through the wall of the cylinder, said rod being adapted to engage the supplemental piston when the same is in one position, a crank shaft for the supplemental piston, a trip lever operable by the first mentioned piston, and a connection between the trip lever and the crank shaft.

3. In an apparatus of the class described, a relatively long piston cylinder, a piston operable in said cylinder, a relatively long piston rod connected with the piston, a carriage or the like operable by said rod, a supplemental piston movable through the wall of the cylinder, said rod being adapted to engage the supplemental piston when the same is in one position, a crank shaft for the supplemental piston, a pair of spaced trip levers each being adapted to be engaged by the first mentioned piston, a connection between one of said trip levers and the crank shaft, and a second connection between the other trip lever and the crank shaft Whereby said supplemental piston Will be operated by the movement of either of said trip levers.

4:. In an apparatus of the class described, a relatively long piston cylinder having an opening in its wall, a housing secured to the cylinder and surrounding said opening, a piston operable in said cylinder, a relatively long piston rod connected with the piston, a carriage or the like operable by said rod, a

supplemental piston movable through the Wall of the cylinder, said rod being adapted to engage the supplemental piston when the same is in one p0sition,'a crank shaft for the supplemental piston, a trip lever pivoted in said housing and having its inner end projecting into said cylinder through said opening whereby to be engaged by the first mentioned piston When the same is shifted in either direction, and a connection between the trip lever and the crank lever.

In testimony that I claim the foregoing I have hereunto set my hand at Phillips, in the county of Price and State of Wisconsin.

CLAUS JOHNSON.

copies of this patent may be obtained for five cents each, by addressing the commissioner of Patents,

Washlngton, D. G. 

